Blowing up medieval gunpowder recipes (IMAGE) American Chemical Society Caption Researchers tested medieval gunpowder recipes in this replica of an early 15th-century stone-throwing cannon. Credit Adapted from ACS Omega 2021, DOI: 10.1021/acsomega.1c03380 Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.